EP 3999837 A1 20220525 - CHIRPED LASER DISPERSION SPECTROMETER AND METHOD
Title (en)
CHIRPED LASER DISPERSION SPECTROMETER AND METHOD
Title (de)
GECHIRPTES LASERDISPERSIONSSPEKTROMETER UND VERFAHREN
Title (fr)
SPECTROMÈTRE À DISPERSION À LASER À COMPRESSION D'IMPULSIONS ET PROCÉDÉ
Publication
Application
Priority
- GB 201910200 A 20190716
- EP 2020070155 W 20200716
Abstract (en)
[origin: GB2585849A] A chirped laser dispersion spectrometer (CLaDS) comprises two tunable lasers 20, 25 each with a bias current supply 45, a chirp signal source 46 to provide a matching chirp pattern, a beam splitter 50 to produce a single beam from the two first and second tunable lasers and active-phase locking means to render the two beams phase coherent and to produce a radio frequency-carrier signal capable of programmable phase modulation by means of an optical beat signal. Also disclosed is a method for generating at least two optical frequency signals for use in a frequency modulation spectroscopy (FMS) process for the detection and/or measurement of molecular species in a gas mixture. The apparatus is suitable for use in Zeeman, Faraday or Stark Effect spectroscopy. The bias current supply 45 may be provided by a common bias current supply. The phase locking technique may be negative electronic feedback or optical injection.
IPC 8 full level
G01N 21/39 (2006.01); G01J 3/433 (2006.01)
CPC (source: EP GB US)
G01J 3/433 (2013.01 - EP GB); G01J 3/4338 (2013.01 - EP US); G01N 21/3504 (2013.01 - US); G01N 21/39 (2013.01 - EP GB US); G01J 2003/423 (2013.01 - US)
Citation (search report)
See references of WO 2021009289A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
GB 201910200 D0 20190828; GB 2585849 A 20210127; GB 2585849 B 20221116; CA 3147485 A1 20210121; EP 3999837 A1 20220525; US 2022260486 A1 20220818; WO 2021009289 A1 20210121
DOCDB simple family (application)
GB 201910200 A 20190716; CA 3147485 A 20200716; EP 2020070155 W 20200716; EP 20749816 A 20200716; US 202017627298 A 20200716